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Clays and Clay Minerals

, Volume 3, Issue 1, pp 103–116 | Cite as

DTA of Kaolinite and Montmorillonite Under Water Vapor Pressures up to Six Atmospheres

  • Robert L. Stone
  • Richards A. Rowland
Article

Abstract

Thermograms of kaolinite and montmorillonite were obtained at water-vapor pressures varying from approximately 0.0001 to 4,500 mm. of Hg with a variable pressure, dynamic gas, differential thermal analysis apparatus. The beginning of the kaolinite endotherm is shifted to a higher temperature with increasing water-vapor pressure. The sharp kaolinite exotherm is shifted to a lower temperature until at six atmospheres water-vapor pressure it makes a small broad peak at approximately 900° C. The dehydroxylation endotherm of montmorillonite is almost unaffected. The 900° C endotherm and the recrystallization exotherm are shifted to a lower temperature with increasing water-vapor pressure. The temperatures of the start of the endothermic peaks associated with exchange cations are shifted upward by increased gas (N2) pressure.

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References

  1. MacGee, A. E. (1926) The heat required to fire ceramic bodies: Jour. Amer. Ceram. Soc., vol. 9, (4), p. 206.Google Scholar
  2. Roy, Rustom (October 1954). Verbal communication.Google Scholar
  3. Speil, Sid., Berkelhamer, T. H., Pask, J., and Daires, Ben. (1945) Differential thermal analysis, its application to clays and other aluminous minerals: U.S. Bur. Mines Tech. Paper 664.Google Scholar
  4. Stone, Robert L. (1951) Differential thermal analysis of clay minerals under controlled thermodynamic conditions: Ohio State Univ., Eng. Exp. Sta. Bull. No. 146.Google Scholar

Copyright information

© The Clay Minerals Society 1954

Authors and Affiliations

  • Robert L. Stone
    • 1
  • Richards A. Rowland
    • 2
  1. 1.University of TexasUSA
  2. 2.Shell Development Co.USA

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